Propertymark
Propertymark is the United Kingdom's largest professional body for property agents, formed in 2017 from the merger of the National Association of Estate Agents (NAEA), the Association of Residential Letting Agents (ARLA), the Institute of Commercial and Business Agents (ICBA) and the National Association of Valuers and Auctioneers (NAVA), and representing "over 19,000 members" across residential sales, lettings, commercial property, inventories, auctions and valuation. Its home market is the United Kingdom - England, Scotland, Wales, Northern Ireland and the Channel Islands. In the property value chain it sits on the agent-accreditation and consumer-protection side, not the listings side: it publishes the Conduct and Membership Rules, operates a government-approved Client Money Protection scheme, runs Propertymark Qualifications as the sector's specialist awarding organisation, and lobbies government on estate and letting agency regulation. Its API posture is the flat, honest zero. There is no developer portal, no documented API, no SDK, no webhooks and no published machine-readable contract of any kind: developer.propertymark.co.uk, developers.propertymark.co.uk, api.propertymark.co.uk, data.propertymark.co.uk and standards.propertymark.co.uk all fail DNS resolution, and /openapi.json, /swagger.json, /api-docs, /api, /developers, /docs, /$metadata and /odata all return honest HTTP 404s from www.propertymark.co.uk. RESO is entirely absent - the site's own search returns "result: 0 of 0" for both "RESO" and "OData" - because the United Kingdom has no MLS and therefore no listing-data certification layer to be certified against; UK residential listings reach consumers through the Rightmove/Zoopla portal duopoly via agency CRM software, several of whose vendors (Reapit, Street, MRI Software, Dezrez, AgentOS, Coadjute, and Rightmove itself) appear in Propertymark's own Industry Supplier directory. What Propertymark does publish freely is its rulebook: the Propertymark Conduct and Membership Rules PDF downloads anonymously with no login and no EULA. Its only machine-readable surface is undocumented - an internal Preside CMS JSON endpoint behind the public Find an Expert member directory - and its member area is SAML-gated, returning HTTP 401. Genuinely open UK property data comes from HM Land Registry and Ordnance Survey, not from the agents' professional body.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Propertymark the way a machine reads it — 2 machine-readable artifacts, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Propertymark scores 15.9/100 (emerging), with a separate agent-readiness read of 7/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Propertymark
Each block below is one kind of artifact we hold for Propertymark. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Propertymark — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Access & Security 7
Authentication, authorization, and security posture
Scroll within the panel for all 7 ·
Learn 1
Tutorials, courses, talks, and written guidance
Operate 2
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 9
The organization behind the API
Scroll within the panel for all 9 ·
Other 12
Properties that don't map to a standard resource type
Scroll within the panel for all 12 ·
← All providers · Data indexed from github.com/api-evangelist/propertymark · machine-readable index on apis.io